Terminal: Add Terminal plugin

Adds a new Terminal plugin that provides a Terminal pane inside
Qt Creator.

Fixes: QTCREATORBUG-8511
Change-Id: I7eacb3efa2463d7df9f383ae3fc33254fb9019a9
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/terminalhooks.cpp

@@ -0,0 +1,48 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include "terminalhooks.h"
+
+#include "filepath.h"
+#include "terminalprocess_p.h"
+
+namespace Utils::Terminal {
+
+struct HooksPrivate
+{
+    HooksPrivate()
+        : m_openTerminalHook([](const OpenTerminalParameters &parameters) {
+            DeviceFileHooks::instance().openTerminal(parameters.workingDirectory.value_or(
+                                                         FilePath{}),
+                                                     parameters.environment.value_or(Environment{}));
+        })
+        , m_createTerminalProcessInterfaceHook(
+              []() -> ProcessInterface * { return new Internal::TerminalImpl(); })
+    {}
+
+    Hooks::OpenTerminalHook m_openTerminalHook;
+    Hooks::CreateTerminalProcessInterfaceHook m_createTerminalProcessInterfaceHook;
+};
+
+Hooks &Hooks::instance()
+{
+    static Hooks manager;
+    return manager;
+}
+
+Hooks::Hooks()
+    : d(new HooksPrivate())
+{}
+
+Hooks::~Hooks() = default;
+
+Hooks::OpenTerminalHook &Hooks::openTerminalHook()
+{
+    return d->m_openTerminalHook;
+}
+Hooks::CreateTerminalProcessInterfaceHook &Hooks::createTerminalProcessInterfaceHook()
+{
+    return d->m_createTerminalProcessInterfaceHook;
+}
+
+} // namespace Utils::Terminal